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  2. Laser pointer - Wikipedia

    en.wikipedia.org/wiki/Laser_pointer

    A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.

  3. Lasers and aviation safety - Wikipedia

    en.wikipedia.org/wiki/Lasers_and_aviation_safety

    Pointing a laser at an aircraft can be hazardous to pilots, [1] and has resulted in arrests, trials and jail sentences. It also results in calls to license or ban laser pointers. Some jurisdictions such as New South Wales, Australia have restricted laser pointers as a result of multiple incidents.

  4. Laser microphone - Wikipedia

    en.wikipedia.org/wiki/Laser_microphone

    Laser microphone. A laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object. It can be used to eavesdrop with minimal chance of exposure. The object is typically inside a room where a conversation is taking place and can be anything that can vibrate (for example, a picture on a wall) in ...

  5. Second-harmonic generation - Wikipedia

    en.wikipedia.org/wiki/Second-harmonic_generation

    Second-harmonic generation ( SHG ), also known as frequency doubling, is the lowest-order wave-wave nonlinear interaction that occurs in various systems, including optical, radio, atmospheric, and magnetohydrodynamic systems. [1] As a prototype behavior of waves, SHG is widely used, for example, in doubling laser frequencies.

  6. Senegal, with fans wielding laser pointers, knocks Egypt and ...

    www.aol.com/sports/senegal-fans-wielding-laser...

    Mohamed Salah and Egypt, dogged by a talented Senegal team and passionate fans wielding laser pointers for 120 minutes, lost a penalty shootout Tuesday and failed to qualify for the 2022 men's...

  7. Laser - Wikipedia

    en.wikipedia.org/wiki/Laser

    The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. [1] [2] The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow.